{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,30]],"date-time":"2026-10-30T22:44:15Z","timestamp":1793400255495,"version":"4.5.0"},"reference-count":53,"publisher":"American Medical Association (AMA)","issue":"10","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["JAMA Netw Open"],"abstract":"\n Importance<\/jats:title>\n The incidence of severe maternal morbidity (SMM)\u2014and particularly cardiovascular SMM (cvSMM), the first cause of pregnancy-related mortality\u2014has been rising in North America. Although hypertensive disorders of pregnancy (HDP) are common, their association with cvSMM specifically remains unclear.<\/jats:p>\n <\/jats:sec>\n \n Objective<\/jats:title>\n To assess the association between individual subtypes of HDP and cvSMM, in addition to overall SMM, in a large, nationally representative sample.<\/jats:p>\n <\/jats:sec>\n \n Design, Setting, and Participants<\/jats:title>\n A population-based cohort study using the United States National Inpatient Sample was conducted. Individuals with obstetric deliveries between 2015 and 2019 were included. Data analysis was performed from October 2023 to February 2024.<\/jats:p>\n <\/jats:sec>\n \n Exposure<\/jats:title>\n HDP subtypes included gestational hypertension, chronic hypertension, preeclampsia without severe features, severe preeclampsia, and HELLP (hemolysis, elevated liver enzymes, and low platelet) syndrome.<\/jats:p>\n <\/jats:sec>\n \n Main Outcomes and Measures<\/jats:title>\n The primary outcome was a composite of cvSMM (including conditions such as pulmonary edema, stroke, and acute myocardial infarction) and the secondary outcome was a composite of overall SMM (including cvSMM and other conditions such as respiratory failure, severe postpartum hemorrhage, and sepsis). Adjusted risk ratios (aRRs) for the association between HDP subtypes and the outcomes were estimated using modified Poisson regression models adjusted for demographic and clinical characteristics.<\/jats:p>\n <\/jats:sec>\n \n Results<\/jats:title>\n \n Among 15\u202f714\u202f940 obstetric deliveries, 2\u202f045\u202f089 (13.02%) had HDP, 23\u202f445 (0.15%) were affected by cvSMM, and 282\u202f160 (1.80%) were affected by SMM. The mean (SD) age of the cohort was of 29 (6) years. The incidence of cvSMM was higher in participants with HDP than those without HDP (0.48% [9770 of 2\u202f045\u202f089] vs 0.10% [13\u202f680 of 13\u202f669\u202f851];\n P<\/jats:italic>\n \u2009&amp;lt;\u2009.001). Participants with HELLP syndrome had the highest risk for cvSMM (aRR, 17.55 [95% CI, 14.67-21.01]), followed by severe preeclampsia (aRR, 9.11 [95% CI, 8.26-10.04]), and chronic hypertension (aRR, 3.57 [95% CI, 3.15-4.05]). Although HDP subtypes were also associated with overall SMM, the association with HELLP syndrome (aRR, 9.94 [95% CI, 9.44-10.45]), severe preeclampsia (aRR, 3.66 [95% CI, 3.55-3.78]), and chronic hypertension (aRR, 1.96 [95% CI, 1.88-2.03]) was attenuated compared with cvSMM.\n <\/jats:p>\n <\/jats:sec>\n \n Conclusions and Relevance<\/jats:title>\n In this cohort study, a graded relationship by severity characterized the association between HDP and cvSMM. Although all HDP subtypes were associated with an increased risk of overall SMM, the risk was more pronounced for cvSMM.<\/jats:p>\n <\/jats:sec>","DOI":"10.1001\/jamanetworkopen.2024.36478","type":"journal-article","created":{"date-parts":[[2024,10,3]],"date-time":"2024-10-03T11:32:14Z","timestamp":1727955134000},"page":"e2436478","source":"Crossref","is-referenced-by-count":30,"title":["Hypertensive Disorders and Cardiovascular Severe Maternal Morbidity in the US, 2015-2019"],"prefix":"10.1001","volume":"7","author":[{"given":"Isabelle","family":"Malham\u00e9","sequence":"first","affiliation":[{"name":"Department of Medicine, McGill University Health Centre, Montreal, Quebec, Canada"},{"name":"Centre for Outcomes Research and Evaluation, Research Institute of the McGill University Health Centre, Montreal, Quebec, Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kara","family":"Nerenberg","sequence":"additional","affiliation":[{"name":"Departments of Medicine, 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